Map grid properties X and Y look disaligned

[SrNetoChan]

Describe the bug

In the map grids properties, the X and Y interval fields are not aligned with the rest.

How to Reproduce

QGIS and OS versions

QGIS version	3.9.0-Master	QGIS code revision	e21ff39
Compiled against Qt	5.9.5	Running against Qt	5.9.5
Compiled against GDAL/OGR	2.2.3	Running against GDAL/OGR	2.2.3
Compiled against GEOS	3.6.2-CAPI-1.10.2	Running against GEOS	3.6.2-CAPI-1.10.2 4d2925d6
PostgreSQL Client Version	11.5 (Ubuntu 11.5-1.pgdg18.04+1)	SpatiaLite Version	4.3.0a
QWT Version	6.1.3	QScintilla2 Version	2.10.2
PROJ.4 Version	493
OS Version	Ubuntu 18.04.3 LTS

Additional context

[nyalldawson]

This is by design - it's following the pattern used elsewhere to reflect that these values apply to the "interval" setting above them

[SrNetoChan]

IMHO, it looks weird.

[nyalldawson]

Maybe we should increase the padding to make it more obvious?